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ELCO Systems
Static Var Compensator (SVC)



Static Var Compensator (SVC) is built on proven thyristor technology. The state-of-the-art thyristor valve is extremely compact in design and delivers superior performance compared with other solutions available in the market.

Fast reactive power compensation with SVC ensures effective flicker mitigation and voltage variation control in steel plants with electric arc furnaces (EAFs), in mining plants with mine winders, excavators, crushers and grinders or to enhance transmission capacity and achieve unity power factor in utilities. SVC provides tailored solutions to meet customer requirements from 3.3KV up to 38.5kV 250MVAr. Merus Power can deliver a complete turnkey solutions. 

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How SVG Works?

Voltage can be controlled by controlling the reactive power flowing in the system. The reactive power can be consumed with inductive reactance (reactors) and produced with capacitive reactance (capacitors). SVC can be understood as adjustable impedance that provides reactive power proportionally to the system supply voltage. SVC impedance can be modified by combining adequate amounts of inductive and capacitive reactance. Inductance is provided by thyristor controlled reactors (TCR) using Merus thyristor valves, while the capacitive part consists of fixed capacitor banks.

When the inductive part is operating at maximum current, the SVC’s output reactive power is zero or inductive, drawing the voltage of the connection point down. When inductive part current is zero, the SVC system, with its maximum capacitive power, pulls the voltage of the connection point up. The capacitor banks also work as passive harmonic filters, fine-tuned to reduce harmonics generated by the thyristors of TCR and by the loads. With the line-commutated thyristors the reaction time of SVC is typically half a network cycle.


Elco System Static Var Cenerators (SVC) Benefits

Main benefits of SVCs can be summarized as: 
1. Increased productivity of steel plants by reducing melt-time
2. Increased torque and payload of large inductive loads with stabilized voltage
3. Transmission and distribution network capacity enhancement
4. Longer plant lifetime
5. Reduced maintenance costs
6. Improved plant reliability

Typical Applications

SVCs have many low and high voltage potential applications where their use offers many benefits.

⦿ Installations with fast changing reactive power demand like electric arc furnaces and ball mills.
⦿ Highly dynamic loads where the power factor fluctuates rapidly or in big steps like cranes, sawmill machinery, welding machines, etc. 
⦿ Correction of leading power factor like in data centers allowing back-up generators operation.
⦿ UPC systems.
⦿ Solar inverters and wind turbine generators. 
⦿ Railway electrification systems: Trains & trams
⦿ Loads with low power factor: Motors, cables, lightly loaded transformers, lighting, etc